Preheat the oven to 350 degrees and lightly grease a 13×9 baking or casserole dish.
Place sour cream, heavy cream, salt, pepper, onion powder and ranch dressing mix in a large bowl and stir until well combined.
Add in the chicken, bacon, and 1 1/2 cup of the shredded cheese and continue to mix until everything is evenly coated.
Spread the chicken mixture in the bottom of your prepared baking dish.
Arrange the frozen tater tots on top of the chicken mixture and then sprinkle the remaining shredded cheese across the top of the casserole.
Bake the casserole for 40-45 minutes or until the tater tots are golden brown and the cheese is melted.